<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>04_BOM操作</title>
</head>
<body>
    <button onclick="alert('警告款')">弹出警告框</button>
    <button onclick="confirm('你确认要删除吗？')">弹出确认框</button>
    <button onclick="prompt('请输入您的会员卡号：')">弹出输入框</button>

    <script>
        //将参数转为整数
        console.log(parseInt(6.6));//6
        console.log(parseInt(6.1));//6
        console.log(parseInt(6));//6
        console.log(parseInt('hhh'));//NaN
        console.log(parseInt('12hh34h5'));//12

        //将参数转为小数
        console.log(parseFloat('5.6'));//5.6
        console.log(parseFloat(5.6));
        console.log(parseFloat('5'));//5
        console.log(parseFloat('hhh'));//NaN
        console.log(parseFloat('12hh34h5'));//12

        //用来判断参数是否为非数字，如果是非数字，结果是true,反之是false
        console.log(isNaN('aaa'));//true
        console.log(isNaN(7));//false
        console.log(isNaN(7.6));//false



    </script>
</body>
</html>